3.6.0

@Ali-Razmjoo

What's Changed

Fix logging of sensitive information in pai.py by @Ali-Razmjoo in #3310
Fix overly permissive file permissions in luigi/lock.py by @Ali-Razmjoo in #3308
Fix unsafe shell command in luigi/contrib/lsf.py by @Ali-Razmjoo in #3307
Fix arbitrary file write during tarfile extraction in luigi/contrib/lsf_runner.py and luigi/contrib/sge_runner.py by @Ali-Razmjoo in #3309
add ChoiceListParameter by @kitagry in #3305
Implement mypy plugin for luigi.Task by @hiro-o918 in #3315
/history/by_task_id : a method to link each task's history uniquely to the SQL database by @tashrifbillah in #3321
Replace os.rename with os.replace by @yyyyuki in #3322
Support Dropbox root_namespace_id for Team Spaces by @smrohrer in #3316
Validate str type before tuple cast by @ikyasam18 in #3323
fix(luigi/contrib/postgres.py): replace copy_from with copy_expert by @delhomer in #3324
Drop Support for Python 3.5 and 3.6 by @dlstadther in #3325
Version 3.6.0 by @dlstadther in #3328

Full Changelog: v3.5.2...v3.6.0